Typewriting machine



July 27, 1926. 1,593,592

A. NEWHOPE TYPEWRITING MACHINE Filed Sept. 29, 1925 Patented July 27,192%.

more srarns PATENT OFFIOE.

ALFRED NEVJHOPE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO UNDERWOOD'TYPEWRITER GOMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYIPEWRITING MACHINE.

Application filed. September 29, 1925. Serial No. 59,258.

This invention relates to sound-deadening means for typewritingmachines, and more particularly to sound-subduing cases which enclosethe lower portions of typewriting machines without affecting theiroperations.

A feature of the invention is the provision of a pliable sound-retardingbag for partially enclosing a typewriting machine from below, withoutinterfering with its operation, which can be inexpensively manufactured,and easily applied to a machine after it has left the factory, and theuse of which will not require additional space. Another feature is theprovision of a pliable sound-absorbing material adapted for use in theconstruction of sound-retarding bags for typewriting machines.

According to the present invention, an open bag is provided which isarranged for neatly enclosing the lower portion of a typewriting machinewhich rests upon the bottomof the bag. The walls of the bag may extendupwardly to'engage snugly against and be substantially flush with thetop of the keyboard-frame at the front, and with the top frame-membersat the sides. The rear wall of the bag may extend upwardly to theway-lrod-supporting frame-members. Relatively stiff framing strips maybe fastened outside along the top edges of the bag on the front andsides, and an adjustable strap means may be provided at the rear forconnecting the side strips and holding the same closely against thetypewriting frame.

The pliable material from which the bag is made may be formed in layers.The outer layer will preferably consist of substantially air-tight,wear-resisting material, while the inner layers may be alternatinglayers of sound-absorbing felt and looselywoven fabric, a layer of thelatter having poor sound-reflecting properties being placed next to themachine.

One of the features of the invention is the arrangement of the walls ofthe bag with an outward bulge to prevent the walls touching any metalparts of the typewriting machine except along their top edges.

Another feature is the arrangement of the back wall of the bag ofalength slightly reater ,than the width of the machine,

i vbereby the side walls may be spread apart Other features aridadvantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view of the sound-deadening bag in place on anUnderwood typewriting machine, the latter being indicated by a phantomview in dash-anddot outlines of portions of the frame, and certain otherprincipal parts. A small portion of the bag is shown broken away at thefront to illustrate its layer construction.

Figure 2 is a rear end view of the same.

Figure 3 shows a cross-sectional view of the bag with an exaggeratedoutward bulge in the front and back walls. An Underwood typewriter isindicated as being lowered to position for fastening the bag to themachine.

Figure 4t is an enlarged fragmentary section through the bottom of thebag for illustrating its layer construction.

In carrying out the invention, provision is made of an open bag 10,constructed of a pliable material hereinafter described. The top of thefront wall 11 of the bag 10 extends upwardly to fit closely against andsubstantially flush with a front member 12 of the usual frame around thekeys 13 of an Underwood typewriting machine 14. The tops of side walls15 of the bag will preferably extend rearwardly from the front wall 11along upwardly-inclined side frame-members 16 of the keyboard frame, andthen vertically along around a framepost 17 to top side members 18 ofthe main rame of the machine, and rearwardly along said top side membersnear the rear of the machine. The tops of the sidewalls of the bag willpreferably be arranged substantially flush with the top edges of saidside frame-members on both their straight and curved portions, which maybe done without interfering with the functioning of any moving parts ofthe machine. Arrangement of the top edges of the bag flush with theframe-members is desirable, because of the neat appearance therebyobtained. It also gives maximum contact area between the bag and theframe.

At the back corners of the machine the top of the bag offsets downwardlyat 19 to pass under outwardly-extending portions 20 of the frame thatsupport the usual wayrod of a typewriting machine. The upper part of aback wall 21 of the bag may have a substantially level top arrangedslightly full, i. e., greater than the distance between the side frames,to permit easy insertion of the machine in the bag. The top line of theback wall may come to the lower edge of said way-rod-supporting portions20. The front wall 11 will preferably have a length equal to, orslightly less than, the front frame-member 12 adjacent the keyboard 13,so that the back may fit snugly on the key-board-frame at the front.

For more securely maintaining the bag 10 in close contact with thetypewriter frame, framing pieces 22, 23 and 24 of re silient metal-likespring steel, which have the necessary stiffness, may be fastened byriveting to the front and sid walls of the bag and be arranged flushwith the top edges thereof. The ends of the frame-strips 22, 23 and 24,as illustrated, are set back a short distance from the front corners ofthe bag, but in certain cases the three strips may be advantageouslymade of one continuous piece.

Two leather strap-members 25 and 26, the first arranged with a buckle27, and the latter with holes 28, may be riveted to the rear ends of theside frame-strips 23 and 24, respectively, as illustrated in Figures 1and 2. lVhile the machine 14: is being lowered into the bag 10 (seeFigure 3), the straps will be loosened. When the tops of theframe-strips 22. 23 and 24 have come flush with the top of theirassociated frameelcmcnts of the machine, the strap-members may bebuckled, so as to draw the side walls of the bag snugly against theframe of the machine. The straps also hold the back wall 21 closely tothe back line of the machine.

As illustrated in Figures 1 and 2, the walls of the bag 10 willpreferably have an out-- ward and convex bulge below the framing strips22, 23 and 2f, so that the inner surface of the walls will be held awayfrom the metallic parts of the machine, and thereby better retard thesound-vibrations of the metallic parts than if they lay against the)arts. To insure that the walls of the bag bulge outwardly and notinwardly, the walls may be arranged with a small initial outward orconvex bulge, as illustrated in Figure 3. Also, to this end, it may bearranged for the top frame-members of the machine, as the latter isbeing lowered into the bag, to come flush with the top of the bag beforefeet 29of the machine rest upon the bottom of the bag. Then, after thestrap-members 26 and 27 are buckled together for holding the bagsecurely to the machine frame and the machine is lowered to the bottomof the bag, the walls of the latter will bulge a small amount fartherout and the top of the bag will still be held neatly flush with Llloseveral top frame-members of the machine.

In the preferred construction of the walls and bottom of the bag 10 isprovided an outer layer 30, preferably made of a piece of relativelythin and substantially air-tight wear-resisting material like leather orrubber. Next to the outside leather layer may be placed a relativelythick layer of soundabsorbing felt 31 followed by a layer 32 ofloosely-woven fabric. A second layer of sound-absorbing felt 33 may beheld against the inner surface of the fabric layer. 011 the inner sideof the second felt layer may be held a layer 34 of the same or similarmaterial as is in layer 32. The function of layer 32 is to provide deadair-space between the two felt layers. The inner layer 3- which has poorsound-reflecting properties, serves to help prevent the bag 10 fromacting as a kind of sounding-board In certain cases, it may besatisfactory to construct the bag with only one layer each of felt andloosely-woven fabric.

The corners and initial outward bulge of the bag 10 may be provided forby separately stretching, crimping, or molding the several layers to thedesired form, before astening them together, or the layers may beassembled flat and afterwards cut at the corners and stitched orcemented.

Variations may be resorted to within the scope of the i vention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A sound-deadening case for a typewrib ing machine haydng a keyboardframe-meniher, side frame-members, and way-rod supporting frame-members,including a pliable open bag arranged for enclosing said mach ne frombelow up to said keyboard frame-member on the front, up to the top ofthe fran'ie-members on the sides, and up to said way-rod supportingframe-members on its back, said bag having relatively still outsideframe-strips fastened along its top, front and side edges, andstrap-and-bucklc means at its back connecting said side frame-strips andarranged for drawing the same closely against said top sideframemembers, said bag being constructed of layer material having anouter layer of wearresisting, air-tight, material and a plurality ofinner layers arranged for absorbing sound-viln'at one.

2. An article of manufacture, including an open, pliable bag ofsound-absorbing material, arranged for partially enclosing a typewritingmachine from below, having a keyboard frame-member, side frame-members,and way-rod supporting frame-members, up to said keyboard frame-memberon the front and up to the top of the frame members on the sides, exceptwhere the bag flfl offsets downwardly to pass under said wayrodsupporting frame-members of the machine, said bag being provided withmetallic frame-strips fastened at its top, along its front and sideedges, and with means in the rear of said machine for holding said sideframe-strips firmly against said top side frame-members.

3. The combination with a typewriting machine, having a front keyboardframemember and upper side frame-members extending from said keyboardframe-member rearwardly to the back of said machine, of an open, pliablebag having sound-absorbing properties and arranged to enclose saidmachine from below up to the top side of said frame-members on its frontand sides, and to a height on its back, a short distance below thehighest portion of said upper side framemembers, and means arranged forholding said bag closely against said frame-members, said holding meansin the form of a yieldable metallic frame secured to the mouth of thebag and fitted for clasping the framework of the typewriting machine.

4. The combination with a typewriting machine, having a front keyboardframemember and upper side frame-members extending from said keyboardframe-member rearwardly to the back of said machine, of an open, pliablebag having sound-absorbing properties and arranged to enclose saidmachine from below up to the top sides of said frame-members on itsfront and sides, and to a height on its back, a short distance below thehighest portion of said upper side framemembers, and means arranged forholding said bag closely against said frame-members, said meansincluding frame-strips fastened to the. outside of said bag at its topalong its front and side edges, and a buckled strap fastened to the rearends of said frame-strips and arranged to hold said bag closely againstthe side frame-members of said machine.

5. The combination with a typewriting machine, having a front keyboardframemember and upper side frame-members, of an open bag having pliable,sound-absorbing walls arranged for partially enclosing said machine onall sides from below and having its end and side walls arranged toextend flush with the tops of said end and side frame-members, and meansfor fastening the top of said Walls against the top of saidframe-members, the side walls of said bag being arranged with initialoutward bulges and initial heights greater at all points than theheights of adjoining points of said framemembers above the bottom ofsaid machine,

whereby said end and side walls may bulge further outwardly uponfastening them to the end of the side frame-members of the machine andlowering the latter to the bottom of said bag.

6. An article of manufacture, comprising an open bag of pliable,sound-proof material, arranged for enclosing a typewriting machine,having a keyboard frame-member, side frame-members and way-rodsupporting frame-members, from below up to its keyboard frame-member onthe front, up to the top of the frame-members on the sides, and up toits way-rod supporting frame-members on the back, said bag beingarranged with strap-andbuckle means for holding it closely against theframe of said machine and having a back wall longer than the width ofsaid machine, arranged to be held closely against said machine by saidstrap-and-buckle means.

7. An article of manufacture, including an open bag of pliable,sound-proof material, arranged for enclosing a typewriting machine,having keyboard frame-members and side frame-members, from below up tothe top of its keyboard frame-member on the front and up to the top ofthe top of the frame-member portions on the sides, said bag beingprovided with framing-strips fastened along its upper and front sideedges, and adjustable strap means fastened to the rear of saidframing-strips, arranged for holding said bag in place on the frame ofsaid machine.

.8. An article of manufacture, comprising a flexible, sound-absorbinglayer material for use in constructing sound-retarding bags forenclosing typewriting machines, said material having a first or outerlayer of substantially thin air-tight material, a second layer ofsound-absorbing felt held against the inner surface of said first layer,a third layer of loosely-woven fabric held against said felt layer, afourth layer of sound-absorbing felt held against said loosely-wovenfabric layer, and a fifth inner layer of loosely-woven fabric havingpoor sound-reflecting qualities held against said fourth layer of felt.

9. An article of manufacture, comprising a flexible, sound-absorbinglayer material suitable for constructing sound-retarding bags fortypewriting machines, said layer of material having an outer layer ofsubstantially air-tight, wear-resisting material and a plurality ofalternating inner layers of sound-absorbing felt and loosely-wovenfabric.

ALFRED NEWHOPE.

